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https://issues.apache.org/jira/browse/TRAFODION-23?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Work on TRAFODION-23 stopped by Qifan Chen.
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> Keyed nested join in TPCH query 2 and 15 disappeared recently
> -------------------------------------------------------------
>
> Key: TRAFODION-23
> URL: https://issues.apache.org/jira/browse/TRAFODION-23
> Project: Apache Trafodion
> Issue Type: Bug
> Reporter: Qifan Chen
> Assignee: Qifan Chen
> Labels: performance
>
> Good keyed nested join in TPCH query 2 and 15 disappeared in recent
> performance test (close to the ones dated 06222015). Each is replaced by a
> hash join which is more expensive to evaluate.
> To fix this case, we can take the following approach.
> 1. Modify the earlier versions of Trafodion so that they compile without
> log4cpp;
> 2. Install the versions on a cluster and run the two queries
> 3. Identity the earliest version of Trafodion in which the NJ->HJ takes place
> 4. Analyze the code change to isolate the root cause
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